PM3350-SW datasheet(75/224 Pages) PMC

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ELAN 8X10

PM3350 ELAN 8 X10

DATA SHEET

PMC-970109

ISSUE 3

8 PORT ETHERNET SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY

Note that the HashBkt field is not used when the data descriptor does not point to an

Ethernet frame.

A slightly different format is used for data descriptors when they are being transferred

between internal firmware routines within the ELAN 8x10 during frame reception on the

eight local MAC channels. This format is strictly transient, and is never visible when the

data descriptor is presented to an external entity or packet driver firmware, but may be

observed if the contents of the work queue (see below) are inspected directly via the

PCI bus interface. The format is as follows:

Byte

Offset

Flags

NextDD

NumPBs

FirstPB

SrcPort

LastPB

DstHBIndx

SrcHBIndx

NextDD:

24-bit pointer to next data descriptor in linked-list of data descriptors forming

work queue.

Flags:

8-bit data descriptor flags field, formatted as below.

FirstPB:

24-bit pointer to first packet buffer in linked-list of packet buffers containing

frame data.

NumPBs:

8-bit count of packet buffers in chain pointed to by FirstPB.

LastPB:

24-bit pointer to last packet buffer in linked-list of packet buffers pointed to by

FirstPB.

SrcPort:

8-bit source port index within device: indicates the MAC channel upon which

the packet was received. For the ELAN 8x10, this ranges from 0 through 7.

SrcHBIndx:

16-bit encoded index of source hash bucket found by address table lookup

hardware.

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